#define _CRT_SECURE_NO_WARNINGS 1
#include <iostream>
#include <map>
#include <cstdio>
#include <cmath>
using namespace std;
int main()
{
    double s, v1, v2;
    cin >> s >> v1 >> v2;
    double l = 0, r = s, t1, t2;
    while (l <= r)
    {
        double mid = (l + r) / 2;
        t1 = mid /v2 + (s - mid) / v1;
        t2 = mid / v2 + (mid - mid / v2 * v1) / (v1 + v2) + (s - (mid - mid / v2 * v1) / (v1 + v2) * v1 - mid / v2 * v1) /v2;
        if (fabs(t1 - t2) <= 1e-5) 
        { 
            printf("%.2lf\n", t1);
            return 0;
        }
        else if (t1 < t2)  r = mid;
        else if (t1 > t2)  l = mid;
    }
    return 0;
}
